Automatic Connector Terminal Insertion and Dual Housing Assembly Machine Design

Project Overview

A Japanese electronics manufacturer required a custom automation machine capable of assembling high-precision electrical connectors by integrating automatic terminal feeding, terminal insertion, and dual connector housing assembly into a single production system.

The primary objective was to increase production efficiency while maintaining the strict dimensional accuracy and quality standards required for electronic connector manufacturing. The system combines automatic feeding of metal terminals from a continuous reel with manual loading of the first connector housing, followed by multiple automated assembly processes using an indexing rotary table.

GMD Services was responsible for the complete mechanical design of the machine, delivering a fully detailed manufacturing package within 60 days using Autodesk Inventor 2020.

Engineering Challenges

Electronic connector assembly requires extremely high positional accuracy. Every metal terminal must be inserted into the plastic housing without deformation while maintaining precise alignment throughout the assembly process.

The main engineering challenges included:

• Designing a reliable reel-fed terminal feeding mechanism
• Maintaining precise indexing of continuous terminal strips
• Synchronizing rotary table movements with multiple assembly stations
• Achieving accurate terminal insertion into the connector housing
• Aligning two connector housings during the secondary assembly process
• Preventing damage to delicate plastic components
• Designing compact tooling with easy maintenance access
• Ensuring long-term production stability for high-volume manufacturing

Because the customer is a Japanese manufacturer, the equipment was designed to meet demanding requirements for repeatability, durability, and production reliability.

Machine Working Principle

The machine performs connector assembly through a combination of automatic feeding and indexed rotary table operations.

Step 1 – Automatic Terminal Feeding

A continuous reel containing stamped metal connector terminals automatically feeds the terminal strip into the machine.

A precision feeding mechanism controls the pitch of the strip, ensuring each terminal is accurately positioned for the next process while maintaining continuous production.

Step 2 – Terminal Guiding to the Rotary Table

After feeding, the connector terminals are guided through a precision transfer mechanism toward the rotary indexing table.

The terminals are positioned at the loading station where they wait to be assembled into the connector housing.

Step 3 – Manual Loading of the First Connector Housing

The operator manually places the first plastic connector housing into a dedicated fixture mounted on the rotary indexing table.

Once loaded, the rotary table indexes to the next station, aligning the housing with the waiting metal terminal.

Step 4 – Terminal Press-Fit Assembly

At the insertion station, a precision pressing mechanism inserts the metal terminal into the connector housing.

The press-fit process is carefully controlled to ensure:

• Accurate insertion depth
• Correct terminal alignment
• No deformation of the metal terminal
• No damage to the plastic housing
• Consistent assembly quality

Step 5 – Second Connector Housing Assembly

After the terminals have been inserted into the first housing, the assembled component moves to a guide station where the assembly is accurately aligned.

The second connector housing is then positioned and pressed onto the assembly, creating the complete connector structure.

This guiding mechanism ensures perfect alignment before the final pressing operation.

Step 6 – Final Clamping and Product Stabilization

Once the two connector housings have been assembled, the completed product moves to the final station.

Two precision clamping mechanisms simultaneously secure both sides of the connector to ensure:

• Stable positioning
• Proper housing engagement
• Final dimensional consistency
• Reliable product quality before unloading

The finished connector is then ready for the next manufacturing process or quality inspection.

Mechanical Design Scope

GMD Services provided complete mechanical engineering services, including:

• Machine concept development
• 3D mechanical design
• Complete assembly modeling
• Rotary indexing table design
• Reel-fed terminal feeding mechanism
• Precision guiding system
• Terminal insertion mechanism
• Secondary housing assembly mechanism
• Clamping mechanism design
• Pneumatic integration
• Motion verification
• Interference analysis
• Manufacturing drawings
• Bill of Materials (BOM)
• Production documentation

Software Used

The entire machine was designed using Autodesk Inventor 2020, including:

• 3D Part Modeling
• Large Assembly Design
• Sheet Metal Design
• Mechanical Motion Verification
• Manufacturing Drawings
• BOM Management

Design Highlights

The machine incorporates several advanced mechanical engineering features:

• Automatic reel-fed connector terminal feeding
• High-precision terminal guiding mechanism
• Rotary indexing table automation
• Manual loading station for the first connector housing
• Precision terminal press-fit system
• Secondary connector housing assembly station
• Dual-side clamping mechanism
• Modular tooling for fast maintenance
• Compact production layout
• High-rigidity machine structure
• Manufacturing-oriented mechanical design
• Reliable continuous production performance

Project Results

The completed machine design successfully achieved the customer’s production objectives by delivering:

• Fully customized automation equipment
• Stable continuous terminal feeding
• High-precision terminal insertion
• Accurate dual connector housing assembly
• Reduced operator workload
• Improved production consistency
• High assembly repeatability
• Manufacturing-ready engineering documentation
• Reliable operation suitable for high-volume production

The project demonstrated GMD Services’ expertise in designing complex automation equipment for the electronics industry while satisfying the stringent quality expectations of Japanese manufacturers.

Why GMD Services

GMD Services specializes in custom industrial automation and mechanical engineering solutions for manufacturers worldwide.

Our capabilities include:

• Custom Machine Design
• Assembly Automation Systems
• Connector Assembly Equipment
• Precision Mechanical Design
• Conveyor and Feeding Systems
• Rotary Indexing Machines
• Industrial Equipment Design
• Autodesk Inventor Engineering
• Motion Simulation
• Manufacturing Documentation

We transform production concepts into reliable, manufacturable automation systems that improve efficiency, product quality, and production capacity.

Need a Custom Connector Assembly Machine?

Whether you require a connector assembly machine, rotary indexing automation system, or a fully customized industrial production machine, GMD Services delivers complete mechanical design solutions—from concept development to production-ready manufacturing documentation.

Contact us today to discuss your automation project